Do not .lowerCase the library name when codegenerating TurboModule Specs

Summary:
The Codegen is generating a broken output if using the default library name: `Packages<GradleModuleName>Spec`.
This diff is fixing the codegenerator to don't call the `.lowerCase` on the library name when generating the Makefile.

Changelog:
[Android] [Fixed] - Do not .lowerCase the library name when codegenerating TurboModule Specs

Reviewed By: ShikaSD

Differential Revision: D32597578

fbshipit-source-id: dee729a44134d7b3878074507191bb2a1c200608